Founders building a channel strategy often treat "mid-market ERP" as one market with one playbook. It isn't. I've spent the most time in Acumatica and Sage, with real exposure to NetSuite and Dynamics, and the partner cultures in each are different enough that a pitch tuned for one will land flat in another.
Acumatica: a younger partner base that's easier to reach, harder to differentiate for
Acumatica's partner community is younger than Sage's and smaller than NetSuite's, and it's genuinely accessible. The publisher runs a tight community, partner events aren't gatekept behind layers of account management, and a well-connected ISV can get in front of a meaningful share of active VARs within a year. I've walked ISVs into their first Acumatica partner conversations off a handful of introductions, not a cold-outreach campaign.
The catch is that everyone else sees the same opportunity. Acumatica's marketplace has grown fast, and a lot of ISVs are chasing the same VARs with the same "plugs right into your ERP" pitch. Getting a meeting is easy. Getting remembered after the meeting is the actual work. The ISVs that do well here lean on the community itself, showing up at the same regional events repeatedly instead of doing one splashy appearance, because Acumatica's partner base rewards familiarity over polish.
Sage: older relationships, slower to move, but sticky once you're in
Sage's partner ecosystem, especially around Sage Intacct and the Sage 100/300 base, is older and more relationship-driven. A lot of these VARs have run the same core ERP practice for over a decade, and they're more conservative about adding a new ISV to their bag. It takes longer to get a first meeting, and it takes longer still to get a first deal, because trust here is built through referrals inside the existing partner network rather than through a publisher-run marketplace listing.
The upside is durability. Once a Sage VAR adopts your product and it performs, that relationship tends to last. These partners aren't chasing the newest thing in the marketplace. They're looking for something they can rely on for years without having to relearn a new vendor relationship. If you're patient enough to earn that trust, the payoff is a smaller number of partners who each produce steady, repeat business, rather than a large list of partners who each produce one deal and disappear.
NetSuite: publisher-mediated, and the publisher relationship is the channel
NetSuite runs a more centralized partner program than either Acumatica or Sage, and Oracle NetSuite's own account teams have real influence over which ISVs get surfaced to which VARs. This changes the entire motion. Recruiting individual NetSuite partners one by one works less well here than earning visibility with the publisher's alliance and channel teams, who then open doors to the SuiteApp partner network on your behalf.
That means the co-sell relationship with the publisher itself matters more in NetSuite than it does in Acumatica or Sage, where the publisher is more of a backdrop to a partner-led motion. If you're going after NetSuite, budget real time for the publisher relationship specifically, not just the VAR list. A cold approach straight to individual NetSuite partners without any publisher visibility is a slower, harder path than it needs to be.
Dynamics: fragmented by which product you're actually in
"Dynamics" isn't one ecosystem. Business Central, Dynamics 365 Finance & Operations, and the various CRM-side products each have distinct partner communities, and a VAR deep in one often has little presence in another. I've seen ISVs assume a single Dynamics channel strategy would cover all of it and get surprised when it only worked for the specific product line they'd actually built relationships in. If Dynamics is part of your plan, get specific early about which product line your integration actually serves, and build the partner list around that, not around "Microsoft" as a category.
Don't run one outreach template across all four
I've seen ISVs write a single partner recruitment email and blast it to Acumatica, Sage, and NetSuite contacts alike, then wonder why response rates vary so much by ecosystem. An Acumatica VAR responds well to a direct, specific pitch referencing a recent community event or a mutual connection, because that ecosystem runs on informal networks. A Sage partner is more likely to respond to a warm introduction from another Sage partner or a publisher contact than to any cold email, no matter how well written. A NetSuite outreach that doesn't at least acknowledge the publisher relationship reads as naive to anyone who's been in that ecosystem a while. Match the outreach to the culture, not just the logo in the subject line.
What stays the same across all of them
Underneath the differences, the fundamentals don't change. Partners in every one of these ecosystems still need a clear economic reason to prioritize your product, still need real enablement instead of a login, and still need someone paying attention to the relationship after the signature. The ecosystem changes how you get in the door and how long trust takes to build. It doesn't change what happens once you're through it. Pick the ecosystem that matches where your product actually fits, then run the same disciplined program either way.